Lock



FIG. 1 is a perspective view of a lock showing our new design;

FIG. 2 is a top view of the lock of FIG. 1;

FIG. 3 is a front view of the lock of FIG. 1;

FIG. 4 is a rear view of the lock of FIG. 1;

FIG. 5 is a bottom view of the lock of FIG. 1;

FIG. 6 is a right side view of the lock of FIG. 1; and,

FIG. 7 is a left side view of the lock of FIG. 1.

The portions of the Figures shown in broken lines are not part of the claimed design and are for illustration only. 

We claim the ornamental design for a lock, as shown and described. 